Perfectionism i.e. needing things to be "just so".

I am a human laser level. If there's a framed something on a wall 1/8" off-kilter, I will see it.

I compulsively rub two of my fingers together, too.

But I don't do the checking, rechecking thing nor do I wash my hands over and over. Nothing like that. Basically just what I've written (and they're enough of a PITA anyway).